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What is "skullcaps"

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Usage examples of "skullcaps".

They were pointedly nondescript, dressed in the drab denim worksuits and blue skullcaps of achievement coordinators from Egalitaria.

In their skullcaps and French clothing, they looked like typical Parisian Jews embarking on their first kibbutz experience, and so it would have seemed when they boarded a bus designated for travel outside the city.